[Reddart]

Not a specific organic question, but I will be performing organic chemistry in the apparatus

This is a problem I'm hoping someone out there has encountered and solved.

I have several SS stir shafts at a standard 3/8" diameter. I see that 3/8" and 10mm seem to be interchangable in print regarding shafts and vacuum adaptors for flasks (example vacuum adapter http://www.chemglass.com/product_view.asp?pnr=CG-2077-G), but in reality, the standard SS shafts I have are 9.525mm, and don't seal with 10mm bearing adaptors.

I was hoping someone made an adaptor for 9.5mm shafts, but I cannot find any. This would be the best solution, as I can use the $500+ worth of stirr shafts and paddels (some very specialized blades).

The other option is trying to someshow coat the shafts with a hardening resin to thicken them up enough to seal. not easy to do evenly, nor best for longterm wear even if successful.

Anyone know of a 9.5mm sealable bearing out there?

[orgopete]

This is not a promise, just an idea. I liked using the Ace Glassware bearing and shafts. One option they have (or was it Kontes?) is a removable bearing. This bearing is held in place with and sealed with an O-ring. Although I'd probably just buy a shaft, if you want to stay with your SS shaft, then I'd try the Ace bearing and buy some different size O-rings to shim it out to the 9.5 mm needed.

You should be able to check a catalog to see if my memory is correct on how these bearings are sealed.